Yoga is a spiritual discipline which is based on an extremely subtle science that concentrates on bringing harmony between mind and body.

瑜伽是一门精神学科，它基于极其微妙的科学，专注于实现身心和谐。

 It is a science and an art of healthy and sound living.

它是一门科学，也是一门健康、健全生活的艺术。

 Yoga improves strength, balance, and flexibility.

瑜伽可以提高力量、平衡和灵活性。

 Slow movements and deep breathing increase blood flow and warm up muscles, while holding a pose can build strength.

缓慢的动作和深呼吸可以增加血液流动并温暖肌肉，同时保持姿势可以增强力量。